<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Hello,<div><br></div><div>I am hoping someone might be able to point out what I am doing wrong. I have setup a Raspberry Pi cluster by going through a couple tutorials. The last step is to use MPI to test the cluster. Everything was going great until I ran the following command:</div><div><br></div><div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">mpiexec -f machinefile -n 4 hostname</div></div><div style="margin: 0px; font-size: 11px; font-family: Menlo;"><br></div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">My machinefile contains the following:</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;"><br></div><div style="margin: 0px;"><div style="font-family: Menlo; font-size: 11px; margin: 0px;"><span style="color: #34bd26"><b>pi@Pi01</b></span> <span style="color: #5330e1"><b>~/mpi_test $</b></span> cat machinefile</div><div style="font-family: Menlo; font-size: 11px; margin: 0px;">192.168.2.121</div><div style="font-family: Menlo; font-size: 11px; margin: 0px;">192.168.2.122</div><div style="font-family: Menlo; font-size: 11px; margin: 0px;">192.168.2.123</div><div style="font-family: Menlo; font-size: 11px; margin: 0px;">192.168.2.124</div><div style="font-family: Menlo; font-size: 11px; margin: 0px;"><br></div><div style="font-family: Menlo; font-size: 11px; margin: 0px;">But, when I run the mpiexec command, I get the following error:</div><div style="font-family: Menlo; font-size: 11px; margin: 0px;"><br></div><div style="margin: 0px;"><div style="font-family: Menlo; font-size: 11px; margin: 0px;"><span style="color: #34bd26"><b>pi@Pi01</b></span> <span style="color: #5330e1"><b>~/mpi_test $</b></span> mpiexec -f machinefile -n 4 hostname</div><div style="font-family: Menlo; font-size: 11px; margin: 0px;">Pi01</div><div style="font-family: Menlo; font-size: 11px; margin: 0px;">[mpiexec@Pi01] control_cb (/home/pi/mpich2/mpich-3.1/src/pm/hydra/pm/pmiserv/pmiserv_cb.c:200): assert (!closed) failed</div><div style="font-family: Menlo; font-size: 11px; margin: 0px;">[mpiexec@Pi01] HYDT_dmxu_poll_wait_for_event (/home/pi/mpich2/mpich-3.1/src/pm/hydra/tools/demux/demux_poll.c:76): callback returned error status</div><div style="font-family: Menlo; font-size: 11px; margin: 0px;">[mpiexec@Pi01] HYD_pmci_wait_for_completion (/home/pi/mpich2/mpich-3.1/src/pm/hydra/pm/pmiserv/pmiserv_pmci.c:198): error waiting for event</div><div style="font-family: Menlo; font-size: 11px; margin: 0px;">[mpiexec@Pi01] main (/home/pi/mpich2/mpich-3.1/src/pm/hydra/ui/mpich/mpiexec.c:336): process manager error waiting for completion</div><div style="font-family: Menlo; font-size: 11px; margin: 0px; color: rgb(83, 48, 225);"><span style="color: #34bd26"><b>pi@Pi01</b></span><span style="color: #000000"> </span><b>~/mpi_test $</b><span style="color: #000000"> </span></div><div style="font-family: Menlo; font-size: 11px; margin: 0px; color: rgb(83, 48, 225);"><span style="color: #000000"><br></span></div><div style="font-family: Menlo; font-size: 11px; margin: 0px; color: rgb(83, 48, 225);"><span style="color: #000000">Clearly, I am missing something. Would appreciate any help in advance.</span></div><div style="font-family: Menlo; font-size: 11px; margin: 0px; color: rgb(83, 48, 225);"><span style="color: #000000"><br></span></div><div style="font-family: Menlo; font-size: 11px; margin: 0px; color: rgb(83, 48, 225);"><span style="color: #000000">Thanks.</span></div><div style="font-family: Menlo; font-size: 11px; margin: 0px; color: rgb(83, 48, 225);"><span style="color: #000000"><br></span></div><div style="font-family: Menlo; font-size: 11px; margin: 0px; color: rgb(83, 48, 225);"><span style="color: #000000">Ken</span></div><div style="font-family: Menlo; font-size: 11px; margin: 0px; color: rgb(83, 48, 225);"><span style="color: #000000"><br></span></div><div style="margin: 0px;"><font face="Menlo"><span style="font-size: 11px;">ps. I am connected to the other Pis evident by the following ping results. I can also log into each of the other 3 Pis.</span></font></div><div style="margin: 0px;"><font face="Menlo"><span style="font-size: 11px;"><br></span></font></div><div style="margin: 0px;"><div style="margin: 0px; font-size: 11px; font-family: Menlo;">ping 192.168.2.122</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">PING 192.168.2.122 (192.168.2.122) 56(84) bytes of data.</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">64 bytes from 192.168.2.122: icmp_req=1 ttl=64 time=0.807 ms</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">64 bytes from 192.168.2.122: icmp_req=2 ttl=64 time=0.626 ms</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">64 bytes from 192.168.2.122: icmp_req=3 ttl=64 time=0.614 ms</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">64 bytes from 192.168.2.122: icmp_req=4 ttl=64 time=0.605 ms</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">64 bytes from 192.168.2.122: icmp_req=5 ttl=64 time=0.603 ms</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">^C</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">--- 192.168.2.122 ping statistics ---</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">5 packets transmitted, 5 received, 0% packet loss, time 4002ms</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">rtt min/avg/max/mdev = 0.603/0.651/0.807/0.078 ms</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;"><span style="color: #34bd26"><b>pi@Pi01</b></span> <span style="color: #5330e1"><b>~/mpi_test $</b></span> ping 192.168.2.123</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">PING 192.168.2.123 (192.168.2.123) 56(84) bytes of data.</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">64 bytes from 192.168.2.123: icmp_req=1 ttl=64 time=0.794 ms</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">64 bytes from 192.168.2.123: icmp_req=2 ttl=64 time=0.634 ms</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">64 bytes from 192.168.2.123: icmp_req=3 ttl=64 time=0.628 ms</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">64 bytes from 192.168.2.123: icmp_req=4 ttl=64 time=0.607 ms</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">^C</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">--- 192.168.2.123 ping statistics ---</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">4 packets transmitted, 4 received, 0% packet loss, time 3003ms</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">rtt min/avg/max/mdev = 0.607/0.665/0.794/0.081 ms</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;"><span style="color: #34bd26"><b>pi@Pi01</b></span> <span style="color: #5330e1"><b>~/mpi_test $</b></span> ping 192.168.2.124</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">PING 192.168.2.124 (192.168.2.124) 56(84) bytes of data.</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">64 bytes from 192.168.2.124: icmp_req=1 ttl=64 time=0.787 ms</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">64 bytes from 192.168.2.124: icmp_req=2 ttl=64 time=0.632 ms</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">64 bytes from 192.168.2.124: icmp_req=3 ttl=64 time=0.612 ms</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">^C</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">--- 192.168.2.124 ping statistics ---</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">3 packets transmitted, 3 received, 0% packet loss, time 2002ms</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;">rtt min/avg/max/mdev = 0.612/0.677/0.787/0.078 ms</div><div style="margin: 0px; font-size: 11px; font-family: Menlo; color: rgb(83, 48, 225);"><span style="color: #34bd26"><b>pi@Pi01</b></span><span style="color: #000000"> </span><b>~/mpi_test $</b><span style="color: #000000"> </span></div></div></div></div></body></html>